Summary: Use docusaurus new config option to force trailing slashes for all routes and fail build when extensions are not specified in markdown links to prevent flapping urls that lead to 404 in certain situations.
Reviewed By: jknoxville
Differential Revision: D32533292
fbshipit-source-id: a2d5fdff396b3bb4319893634dd637275ea9f598
7d4a6437ef